2-Chloro- N-[( S)-phenyl [(2 S)-piperidin-2-yl] methyl]-3-trifluoromethyl benzamide, monohydrochloride, an inhibitor of the glycine transporter type 1, increases evoked-dopamine release in the rat nucleus accumbens in vivo via an enhanced glutamatergic neurotransmission

• Published in: Neuroscience Vol. 137; no. 2; pp. 555 - 564
• Main Authors: Leonetti, M., Desvignes, C., Bougault, I., Souilhac, J., Oury-Donat, F., Steinberg, R.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2006; Elsevier
• Subjects: Adult and adolescent clinical studies; Amygdala - physiology; Animals; basolateral amygdala; Benzamides - pharmacology; Biological and medical sciences; CE-LIFD; Dopamine - metabolism; Electric Stimulation; electrochemistry; Excitatory Amino Acid Antagonists - pharmacology; Extracellular Fluid - drug effects; Extracellular Fluid - metabolism; Fundamental and applied biological sciences. Psychology; Glutamic Acid - metabolism; Glycine - metabolism; Glycine Plasma Membrane Transport Proteins - antagonists & inhibitors; Glycine Plasma Membrane Transport Proteins - metabolism; Male; Medical sciences; Microdialysis; Neural Pathways - physiology; Nucleus Accumbens - drug effects; Nucleus Accumbens - metabolism; Piperidines - pharmacology; Presynaptic Terminals - drug effects; Presynaptic Terminals - metabolism; Psychology. Psychoanalysis. Psychiatry; Psychopathology. Psychiatry; Psychoses; Rats; Rats, Sprague-Dawley; Receptors, AMPA - antagonists & inhibitors; Receptors, AMPA - metabolism; Receptors, N-Methyl-D-Aspartate - antagonists & inhibitors; Receptors, N-Methyl-D-Aspartate - metabolism; Schizophrenia; Synaptic Transmission - drug effects; Synaptic Transmission - physiology; Vertebrates: nervous system and sense organs; PBS; AMPA; electrochemistry; AAd; APV; GlyT1; NDA; schizophrenia; SSR504734; DNQX; Glu; β-CD; microdialysis; DPA; Gly; BLA; Nacc; NMDA-R; NaCN; basolateral amygdala; CE-LIFD; DA; Dopamine; Amygdala; Rat; microdialy sis; Rodentia; Central nervous system; Schizophrenia; Basal ganglion; Catecholamine; Glycine; Encephalon; Psychosis; Nucleus accumbens; Vertebrata; Mammalia; Animal; Neurotransmitter; Release; Neurotransmission; Carrier protein
• ISSN: 0306-4522; 1873-7544
• DOI: 10.1016/j.neuroscience.2005.09.003

2-Chloro-N-S-phenyl 2S-piperidin-2-yl methyl]-3-trifluoromethyl benzamide, monohydrochloride (SSR504734) is a potent and selective inhibitor of the glycine transporter type 1, which increases central
N-methyl-
d aspartate glutamatergic tone. Since glutamate has been shown to play a role in the regulation of the dopaminergic system in dopamine-related disorders, such as schizophrenia, we investigated the possibility that SSR504734 may modify the basolateral amygdala-elicited stimulation of dopamine release in the nucleus accumbens via an augmentation of glutamate receptor-mediated neurotransmission. First, our data confirmed that SSR504734 is an inhibitor of GlytT1. In the nucleus accumbens of anesthetized rat, SSR504734 (10mg/kg, i.p.) induced an increase of extracellular levels of glycine as measured by microdialysis coupled with capillary electrophoresis with laser-induced fluorescence detection. Second, the data demonstrated that SSR504734 (10mg/kg, i.p.) enhanced the facilitatory influence of glutamatergic afferents on dopamine neurotransmission in the nucleus accumbens. Using an electrochemical technique, we measured dopamine release in the nucleus accumbens evoked by an electrical stimulation of the basolateral amygdala. SSR504734 facilitated dopamine release evoked by a 20 or a 40Hz frequency basolateral amygdala stimulation. This facilitatory effect was dependent on glutamatergic tone, as intra-nucleus accumbens application of 6-7-dinitroquinoxaline-2,3-dione (10
−3 M) or
dl-2-amino-5-phosphonopentanoic acid (10
−3 M), α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid and
N-methyl-
d aspartate receptors antagonists, respectively, inhibited dopamine release evoked by basolateral amygdala stimulation. Furthermore
dl-2-amino-5-phosphonopentanoic acid co-administrated with SSR504734 hampered the dopamine-evoked release facilitation. These data underline the
in vivo implication of the glycine uptake mechanism in the control of subcortical glutamate/dopamine interactions.